NMVpnConnection
NMVpnConnectionState nm_vpn_connection_get_vpn_state (NMVpnConnection *vpn);
NMVpnConnection *vpn
const char * nm_vpn_connection_get_banner (NMVpnConnection *vpn);
#define NM_VPN_CONNECTION_VPN_STATE "vpn-state"
#define NM_VPN_CONNECTION_BANNER "banner"